FlutterUtilsThe most complete tool class in the whole network

catalogue

• 01. Event notification Bus class
• 02. Color The Color tool class
• 03. Date conversion tool class
• 04.File tool class
• 05.Sql database tool class
• 06.Json conversion tool class
• 07.Log Log printing tool class
• 08. Screen parameter tool class
• 09.Sp lightweight storage tool class
• 10. Auxiliary computing tools
• 11. Encryption and decryption tool classes
• 12.Num format processing tool class
• 13. Tool class for obtaining device parameters
• 14. Image processing tools
• 15. Network processing tools
• 16. Common regular tool class
• 17.Object Common utility class
• 18. Verify related tool classes
• 19. Route management tools
• 20.Bus event utility class
• 21.Text The Text utility class
• 22. I18 Extension tool class
• 23.Time Tool class
• 24.SPI help tool class
• 25. Timer helper class
• 26. Common extension tool classes
• 27. Memory cache tool class
• 28. Clear the operation tool class
• 29. Codec related tools
• 30. Reflection related tool classes
• 31. Resource related tool classes
• 32. Snackbar tools
• 33. Transform related tool classes
• 34. Global exception catching tool
• 35. Parse data utility class
• 36. Byte conversion tool class
• 40. Other related tool classes

00. Description of the library

• The library address: github.com/yangchong21…

00.1 Summary of the library tool classes

How does 00.2 use the library

• Specific documents can be demo

01. Event notification Bus class

• Event bus
  • The subscriber pattern, which includes the roles of publisher and subscriber, is typically implemented.
• The first way is to implement the bus using the map set to store the key for the event eventName and the value for EventCallback

  // Register to listen to bus
  _subscription = EventBusService.instance.eventBus.on<EventMessage>().listen((event) {
        String name = event.eventName;
        // The foreground/background switch has changed
        if (name == "eventBus1") {
          var busMessage = event.arguments["busMessage"]; setState(() { message1 = busMessage; }); }});// Send the message
  EventBusService.instance.eventBus.fire(EventMessage(
    "eventBus1",
    arguments: {"busMessage": "Send bus message 1"}));// Page destroy to clear the bus
  if(_subscription ! =null) {
    _subscription.cancel();
    _subscription = null;
  }
  Copy the code

• The second way is to implement bus event notification using StreamController

  Bus. on("eventBus2", (arg) {var busMessage = arg; SetState (() {message2 = "receive message:" + busMessage; }); }); Var arg = "send bus message 1"; bus.emit("eventBus2", arg); // Remove message bus.off("eventBus2", (arg) {});Copy the code

02. Color The Color tool class

• Color Color tool class. Convert RGB or ARGB colors to Color objects, hexadecimal Color strings, etc.

  HexToColor: convert #FF6325 Color or #50A357D6 Color to hexadecimal Color colorString: ColorString: Checks whether the string is hexadecimalCopy the code

03. Date conversion tool class

• Date conversion tool class. The main methods are to get the current date, format the time in a specified format, and a variety of date formatting tools

  GetNowDateTime: Get the current date return DateTime getYesterday: Get the yesterday date return DateTime getNowUtcDateTime: GetNowDateTimeFormat: Gets the current date and returns the specified format. GetUtcDateTimeFormat: Gets the current date and returns the specified format. IsYesterday: GetNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString getNowDateString The first field is dateTime, and the second option represents the format formatDateString: FormatDateMilliseconds: for example: '2021-07-18 16:03:10' for example: 'YYYY /M/d HH:mm:ss' for example: Format dateTime milliseconds. The first field is 1213423143312, and the second field is "YYYY /M/d HH:mm:ss". GetWeekday: Obtains dateTime milliseconds. IsToday: indicates whether it isToday based on the timestamp. IsYesterday: indicates whether it was yesterday based on the timeCopy the code

04.File tool class

4.1 File Storage Tool classes

• File storage tool class. This is to store and get String, Json and other files, this is to store to the local file file

  GetTempDir: Gets a temporary directory (cache) that the system can clean at any time. GetAppDocDir: Gets the application's directory for storing files that only it can access. The directory is cleared only when the application is deleted. ReadStringDir: Gets data from existing files. By default, it reads to the application directory writeJsonFileDir: WriteStringDir: uses a file to store strings. By default, writeStringDir: writes to an application directory. ClearFileDataDir: deletes cached data. Delete a cache file writeJsonCustomFile: writes a JSON file with a custom path writeStringFile: uses a file to store strings with a custom path readStringCustomFile: Obtains data stored in a file with a custom pathCopy the code

4.2 File management Tools

• File management tool class. The main operation is to create different directory paths, create files, or directory paths.

  GetTempPath: Obtains the path of the temporary directory on the device. This directory is not backed up and is suitable for storing the cache of downloaded files. GetAppDocPath: Gets the application's directory for storing files that only it can access. The directory is cleared only when the application is deleted. GetStoragePath: path of the directory where the application can access top-level storage createDirSync: Creates a file asynchronously createDir: creates a file synchronously createTempDir: creates a temporary directory createAppDocDir: creates a temporary directory Create a directory to retrieve the applicationCopy the code

05.Sql database tool class

• To be perfect

06.Json conversion tool class

• Json transformation tool class. Json conversion common operations, gradually improve the list, map and JSON string conversion and so on.

  PrintJson: print printJsonEncode: print encodeObj: Convert an object [value] to a Json string getObj: GetObject: Converts A JSON string to an object or JSON map [source] to an object. GetObjList: Converts a JSON string list [source] to an object. GetObjectList: converts a JSON string list [source] to an object. Converts a JSON string or JSON mapping list [source] to an object listCopy the code

07.Log Log printing tool class

• Log Log printing tool class. Five different types of logs. Tag filtering can also be added.

  Init: initializes the log, customizes the tag, specifies whether the debug environment is correct, and specifies the maximum length of the log. These fields are optional. D: Prints debug logs. E: Prints error logsCopy the code

08. Screen parameter tool class

• Screen parameter tool class. Get screen width, height, pixel density, status bar, etc. Later perfect adaptation work……

  ScreenWidthDp: current device width dp screenHeightDp: current device height DP pixelRatio: current device pixel density screenWidth: ScreenHeight: current device width px = dp * density screenHeight: current device height px = dp * density Bottom safe zone distance DP textScaleFactory: The number of pixels of the font in pixels, the scale of the fontCopy the code

09.Sp lightweight storage tool class

• Sp lightweight storage tool. Sp storage and access to int, String, list, map and other data operations.

  HasKey: determines whether data for keys exists putObject: stores data of type object. GetObject: Gets map data for keys in sp. PutObjectList: Storage sp key list collection getObjectList: the set of access to key in the sp list get string: for sp, key string putString: storage sp key string getBool: PutBool: stores the Boolean value of the key in sp. GetInt: Stores the int value of the key in SP. PutInt: Stores the int value of the key in SP. GetDouble: stores the int value of the key in SP. For key in the sp double value putDouble: storage sp double value of the key getStringList: access to key in the sp list < String > value putStringList: PutStringMap: stores list<String> values of keys in sp getStringMap: obtains map values of keys in SP putStringMap: stores map values of keys in SP getDynamic: stores list<String> values of keys in SP GetKeys: Obtains all keys in SP. Remove: removes values of keys in SP. Clear: clears sp. IsInitialized: checks initialization. ForEach: Checks initialization. Iterate over the key and value of the print SPCopy the code

11. Encryption and decryption tool classes

• Encryption and decryption tool classes. Currently, base64 encryption and decryption and MD5 encryption are supported. Later gradually improve more encryption methods……

  EncodeMd5: MD5 encrypted string, this is irreversible encodeBase64: Base64 encrypted string decodeBase64: Base64 decrypted string xorBase64Encode: XorBase64Decode: XORBase64 decryptionCopy the code

12.Num format processing tool class

• Format processing tool class. It mainly deals with operations related to num format conversion.

  IsNum: checks whether the string is an int or a double. GetIntByValueString: converts the numeric string to an int. If the string is not a number, convert to 0. GetDoubleByValueString: Convert a numeric string to a double. GetNumByValueString: converts the numeric string to num with the x decimal place reserved. GetNumByValueDouble: Saves the x decimal place for a floating point number. AddNum: converts the x decimal place for a floating point number. DivideNum: divide two numbers (to prevent precision loss) addDecString: divide two numbers (to prevent precision loss). SubtractDecString: subtracting two numbers (to prevent accuracy loss). MultiplyDecString: multiplying two numbers (to prevent accuracy loss). DivideDecString: dividing two numbers (to prevent accuracy loss).Copy the code

14. Image processing tools

• Other to be improved, add rounded corners, circular cutting pictures, and processing local images and other methods. Later to improve the acquisition of image attributes, image compression, a variety of fillet method.

  FileToBase64: Convert file to Base64 networkImageToBase64: fileToBase64: Convert file to Base64 ShowNetImageWh: Load the network image and specify the width and height. Use default preloading loading and error view showNetImageWhError: Load network images and specify width and height. Pass in the error view showNetImageWhPlaceError: Load the network image and specify the width and height. ShowNetImageWhClip: Load the network image and specify the width and height. Cut the rounded corners. ShowNetImageCircle: Load the network image and cut the round imageCopy the code

15. Network processing tools

15.1 Network request tool class

15.2 Url Parsing tool class

• Tool classes for dealing with URL parsing

  GetFirstPath: Gets the first parameter in the URL. GetUrlHost: gets the host in the URL. GetUrlScheme: Get url link Scheme getFirstPath: Get the first parameter in the URL. IsURL: Return the regular expression of whether the input matches the URLCopy the code

16. Common regular tool class

• Use regular expressions, borrow from AndroidUtils utility classes, and convert Java to Dart

  IsMobileSimple: indicates that the mobile phone number is simple. IsMobileExact: indicates that the mobile phone number is exact. IsTel: indicates that the phone number is accurate. IsIDCard18Exact: indicates the exact id number. 18-digit isEmail: indicates the email address. IsURL: indicates the URL. Verify date verification in YYYY-MM-DD format, with a flat leap year in mind. IsIP: Verify THE IP address. Match: Determine whether the match is regular RegexConstants. RegexConstants.REGEX_BLANK_LINE: blank line RegexConstants.REGEX_QQ_NUM: QQ id RegexConstants.REGEX_CHINA_POSTAL_CODE: Postcode RegexConstants.REGEX_INTEGER: Integer RegexConstants.REGEX_POSITIVE_INTEGER: Positive integer RegexConstants.REGEX_NEGATIVE_INTEGER: Negative integer RegexConstants.REGEX_NOT_NEGATIVE_INTEGER: Non-negative integer RegexConstants.REGEX_NOT_POSITIVE_INTEGER: non-positive integer RegexConstants.REGEX_FLOAT: Floating point RegexConstants.REGEX_POSITIVE_FLOAT: Positive floating point RegexConstants.REGEX_NEGATIVE_FLOAT: Negative floating point RegexConstants.REGEX_NOT_NEGATIVE_FLOAT: non-negative floating point RegexConstants.REGEX_NOT_POSITIVE_FLOAT: non-positive floating pointCopy the code

17.Object Common utility class

• Object related utility classes are as follows:

  IsNull: checks whether the object isNull. IsNullOrBlank: checks whether the data is empty or empty (or contains only Spaces). IsEmptyString: checks whether the string is empty. IsEmpty: determines whether object isEmpty. IsNotEmpty: determines whether object isNotEmpty. CompareListIsEqual: compares two sets to see if they are the sameCopy the code

18. Verify related tool classes

• Verify the relevant utility classes

  IsNumericOnly: Checks whether the string contains only numbers. IsAlphabetOnly: checks whether the string contains only letters. IsVector: Checks whether the string is a vector file. IsImage: checks whether the string is an image file. IsAudio: checks whether the string is an audio file. IsDocument: Checks whether the string is a doc file. IsExcel: Checks whether the string is an Excel file. IsPPT: Checks whether the string is a PPT file. IsPDF: Checks if the string is a PDF file. IsHTML: Checks if the string is an HTML file. IsURL: Checks if the string is a URL file. IsDateTime: checks whether the string is the email file. IsMD5: checks whether the string isMD5. IsSHA1: checks whether the string isSHA1. Check whether the string for ipv4 isIPv6: check whether the string for ipv6 isPalindrome: check whether the string for palindrome isCaseInsensitiveContains: check whether contain b (lowercase letters as same or explain). IsCaseInsensitiveContainsAny: check whether does it include a, b or b contains a (lowercase letters as the same). IsCamelCase: Checks whether the string value is humped. IsCapitalize: Checks whether the string value is capitalizedCopy the code

19. Route management tools

21.Text The Text utility class

• The text-related tool classes are as follows:

  IsEmpty: determine whether the text content isEmpty isNotEmpty: determine whether the text content isNotEmpty startsWith: determine whether the string startsWith xx contains abbreviate: Use the dot abbreviation string compare: compare two strings to see if they are the same hammingDistance: Compare two strings of the same length with different characters. HideNumber: hide the middle n bits of the mobile phone number. For example, hide the mobile phone number 13667225184 as 136****5184 replace: replace the data in the string split: Return the array reverse: reverses the stringCopy the code

22. I18 Extension tool class

• LocatizationExtensionState class: String get String (String id)
  • Get content in different Locales channel languages. For example: var name = context.getString(“name”);
• LocatizationExtensionContext class: String get String (String id)
  • Get content in different Locales channel languages
• How to add content in different channel languages. In the main function before runApp

  AppLocalizations.supportedLocales = [
      const Locale('en'.'US'),
      const Locale('pt'.'BR'),
      const Locale('ja'.'JP'),
      const Locale('zh'.'CN')];Copy the code

23.Time Tool class

24.SPI help tool class

• A Brief introduction to SPI
  • Service Locator separates and decouples the interface (abstract base class) from the concrete implementation, while allowing access to the concrete implementation from any location in the App through the interface.

  // Register GetIt serviceLocator = GetIt. Instance; getIt.registerSingleton<BusinessService>(new BusinessServiceImpl()); BusinessService = serviceLocator<BusinessService>(); businessService.noneBusinessPattern(); / / the third solution to tie the serviceLocator. ResetLazySingleton < BusinessService > ();Copy the code

25. Timer helper class

• Timer helper class

  TimerUtils: set the countdown Timer setTotalTime: Set the total countdown time setInterval: set the Timer interval startTimer: start the Timer Timer updateTotalTime: Reset the total countdown time isActive: determines whether the Timer is started. PauseTimer: Suspends the countdown Timer. Cancel: cancels the countdown TimerCopy the code

26. Common extension tool classes

Int extension class: ExtensionInt

• ExtensionInt expanding class

  IsOneAKind: Check whether all the data has the same value. ToBinaryInt: Check whether the int is a palindrome. Converts an int value to a binary stringCopy the code

26.2 List Extension: ExtensionList

• ExtensionList expanding class

  ToJsonString: converts list toJsonString getJsonPretty: converts list toJsonString, newline valueTotal: gets total value of num list (int/double) isNull: IsNullOrBlank: Checks whether the data is empty or empty (empty or contains only Spaces)Copy the code

26.3 Map Extension class: ExtensionMap

• ExtensionMap extension class

  ToJsonString: converts a map to a JSON string. GetJsonPretty: converts a map to a JSON string. Newline.Copy the code

26.4 String Extension class: ExtensionString

• ExtensionString expanding class

  IsNull: checks whether the object isNull. IsNullOrBlank: checks whether the data is empty or empty (empty or contains only Spaces). IsNumericOnly: checks whether the string contains only numbers. IsVector: Checks whether the string is a vector file. IsImage: checks whether the string is an image file. IsAudio: checks whether the string is an audio file. IsDocument: Checks whether the string is a doc file. IsExcel: Checks whether the string is an Excel file. IsPPT: Checks whether the string is a PPT file. IsPDF: Checks if the string is a PDF file. IsHTML: Checks if the string is an HTML file. IsURL: Checks if the string is a URL file. IsDateTime: checks whether the string is the email file. IsMD5: checks whether the string isMD5. IsSHA1: checks whether the string isSHA1. Check whether the string for ipv4 isIPv6: check whether the string for ipv6 isPalindrome: check whether the string for palindrome isCaseInsensitiveContains: check whether contain b (lowercase letters as same or explain). IsCaseInsensitiveContainsAny: check whether does it include a, b or b contains a (lowercase letters as the same). IsCamelCase: Checks whether the string value is humped. IsCapitalize: Checks whether the string value is capitalizedCopy the code

33. Transform related tool classes

• Transform the related operation tool classes

  You can use toBinaryInt to transform an int into a binary and capitalize the capitalize that you bring to the book CapitalizeFirst: Capitalize the first letter of the string and the other letters in lowercase removeAllWhitespace: remove all Spaces in the string. NumericOnly: Extract the numeric value of the stringCopy the code

34. Global exception catching tool

• For flutter global exception capture, use: handLE_Exception

  // If used, in the main method, look like this: hookCrash(() {runApp(MainApp()); });Copy the code

• To capture a printout:

  I/flutter (9506) : yc e -- -- -- -- -- st -- -- -- -- -- -- -- I/flutter (9506) : yc e | handle_exception: e---->MissingPluginException(No implementation found for method getAll on channel plugins.flutter.io/shared_ I/flutter ( 9506) : yc e | preferences) I/flutter (9506) : yc e -- -- -- -- -- - Ed -- -- -- -- -- -- -- -- -- I/flutter (9506) : yc e handle_exception : stack---->Copy the code

35. Parse data utility class

• Parse XML/HTML data utility class

36. Byte conversion tool class

• ByteUtils transforms the related operation tool class

  ToBinary: convert the int toBinary toReadable: convert the byte array to a readable string toBase64: convert the byte array to a base64 string fromBase64: convert the base64 string to a byte array clone: Clone byte array same: determine whether two bytes are identical Extract: extract data from a sequence of bytes Combine: combine two bytes insert: insert a byte into an index of a byte remove: remove a byte from an index of a byteCopy the code

40. Other related tool classes

40.2 Random tool class

• RandomUtils

  RandomColor: generates a random integer representing a hexadecimal color randomString: generates a randomString of a specified length or random length randInt: generates a random number between the beginning and the end randomElement: returns a randomElement from a listCopy the code

40.3 Obtaining platform tools

• PlatformUtils. The utility class can differentiate platform information by taking the platform and then setting a value.

  final value = PlatformUtils.select( ios: "ios", android: "android", web: "web", fuchsia: "fuchsia", macOS: () => "macOS", windows: () => "windows", linux: () => "linux", ); // As a result, on an Android device, value is: AndroidCopy the code

Clipboard tool class

• System tools, mainly soft keyboard operations and copy content to the clipboard

  CopyToClipboard: copies the text to the clipboard. HideKeyboard: hides the soft keyboard. For details, see the following: TextInputChannel showKeyboard: displays the soft keyboardCopy the code

41. Reference items and blogs

• Github.com/Blankj/Andr…
• Pub. Dev/packages/em…
• Blog.csdn.net/iotjin/arti…
• Cloud.tencent.com/developer/a…
• Blog.csdn.net/yechaoa/art…
• Blog.csdn.net/aau88497/ar…
• Github.com/Sky24n/flus…
• Github.com/a14n/dart-d…
• Pub. Dev/packages? Q =…

The library address:Github.com/yangchong21…